Slag-heated boiler.



No. 746,240. PATENTED DB0. s, 190s.k

' R. BAGGALBY. SLAG HEATED BOILER.

APPLICATION FILED FEB,14, 1903.

UNITED STATES Patented. December 8, 1903.

V*PATENT OFFICE.

RALPH BAGGALEY, OF PITTSBURG, PENNSYLVANIA.

vSLAG-HEATH: BOILER.

SPECIFICATION forming part of Letters Patent'No. 746,240, dated December8,-1903. Application filed February 14, 1903. Serial No. 143,389. (Nomodel.)

To all whom it #my concern: Be it known that I, RALPH BAGGALEY, of

Pittsburg, in the county of Allegheny andV State of Pennsylvania, haveinvented a'new and useful Slag-Heated Boiler, of which the following isafull, clear, and exact description, reference being had to theaccompanying drawings, forming part of this specification,`

in which- Figure 1 is a side elevation, partly in vertical section,illustrating my invention. Fig.

2 is a sectional view showinga modified con-- struction of the means foreffecting the discharge of the slag from the molds. Fig. 3 is a sideelevation, partlyin vertical section,show

` ing modified apparatus for coating'the molds before they are suppliedwith slag.`

I am aware that heretofore patents'have,

been granted in which ithas been proposed to discharge moltenslag lfromsmelting-furnaces upon a traveling platform and to convey it through theshell of a steam-boiler; but so far as I know such boilers lhave neverbeen put into use and the plans proposed have been inherently defective.I

The purpose of my invention is to provide an efficient boiler in whichthe defects of prior constructions are not present; and it consists inthe combination, with a boiler, of a slagconveyer which is arranged totravel through a heating-chamber which is external to theheating-surface of the boiler, but in proximity thereto,the boiler beingprovided with flues o1" 'passages through which the hot gases of theslag and the air which is heated by the slag can pass,'the boiler beingthus heated not only by'direct radiation, but also by the gas and air,which derive heat from the incandescent slag and transmit it to theboiler.

The invention also consists in other features described below andsummarized in Ythe claims.

In the drawings I show my invention applied to a horizontal boiler ofthe fire-tube type; but with suitable modicationsit can be appliedtowater-tube boilers and boilersof other design.

2 is the boiler-shell, traversed by tubes 3 and having a stack LL,provided with the usual damper 5.

Beneath the boiler -shell and extending nearly from end to end thereofis a substantially closedv heating-chamber 6, which communicates withthe vrear end of the tubes- 3 and is otherwise preferably closed exceptfor openings 7 at the ends, through which passes Y the upper branch ofan endless chain carry- .ing a series of open trough-shape molds 8,

the lower branch of the chain passing through a water-tank 9 below theboiler.

l() 10 are sprocket-wheels over which the chain passes, and ll isa spoutoutside the" chamber adapted to supply molten slag to the they arecoated with a refractory wash of lime,

clay, or the like mixed with water. The means shown in Figpl for thispurpose consists of a tank 13, containing themixture and provided with arevolving shaft 14, carrying flexible arms 15,0f cloth or rubber. Theshaft is rotated at a faster rate than the endless chain of molds, sothat the arms l5, whichtravel above and below the surface of themixture, give several wiping strokes to the surface of each mold as itpasses, and thus coat'it with the wash. The revolving arms also keep themixture in the required state of agitation. The purpose of thus coatingthe molds is to protect them from injury by the slag and to prevent theslag from sticking tothem.

.In the modified apparatus shown in Fig. 3 the tank 14', which containsthe refractory Wash, is provided with a rotating paddle 15',

discharge-pipe 16, which yterminates n-an ejector-nozzle 17, directedtoward the molds. A pipe 18 discharges compressed air or steam into thenozzle and causes the refractory wash to be discharged in a spray uponthe surface of the molds.

In using the boi-ler the series of molds 8 is Y driven by power appliedto one of the wheels l10 and is caused to travel inthe direction of thearrow. Molten slag'is deliveredto the molds as they pass the lspout ll,being taken either directly from a smeltiug -furna'ce or from anintermediate ladle or receiver. y The slag-filled molds pass through thechamber 6 below the boiler, and thus present to the which keeps themixture agitated, and has a rec boiler a hot radiant mass as wide as theboiler and nearly as 1ong,wl1ich rapidly heats the water and causes thegeneration of steam. The hot gases from the slag and the air whichenters the chamber through the openings 'aud is heated by contact withthe hot surface of the slag on the upper side of the molds and bycontact with the hot surface of the molds on the under side pass throughthe fines 3 into the stack, their flow through the stack being regulatedby the damper to the rate best adapted to insure the most efticientheating of the boiler. The boiler is thus heated by direct radiationfrom the hot slag and by convection of heat by the gases and air whichpass from the slag and from the hot molds through the boiler-fines.

When the molds pass from the rear end of the chamber 6, the slag whichthey contain Will have been solidified, and when they pass over the rearsprocketI 10 and into the watertank the sudden chilling of the slag Willcanse it to disintegrate and the particles will drop upon a conveyer 19,which carries them ont of the tank to a car or dumping-place. The moldsthence travel through from the tank, past the coating apparatus 13, andunder the slag-spout.

When the boiler is used iu localities having an abundant supply ot'water, I may substitute for the tank 9 a pipe 20, Fig. 2, whichdischarges a stream of water upon the molds after they have emerged fromthe chamber 6, and thus causes the slag to disintegrate and to drop uponthe conveyer 19.

My apparatus renders the operation of the boiler entirely mechanical,and as it provides for the efficient utilization of the slag, whichheretofore has been Wasted, it eects a great economy in the working of asmelter plant.

The skilled mechanic will be able to modify the apparatus in variousWays without de pai-ture from my invention, since l. A slag-heatedboiler having a substantially closed heating-chamber external to theheating-surface, a slag-carrier exposed on its upper and lower surfaceto the air in the chamber, means for causing the carrier to traverse thechamber, and means for supplying the carrierwith molten slag, saidboiler having a Hue or fines extending from the chamber along thehealingsnrface to a staclo opening for the passage of the heated air andgases from the carrier and from the slag, whereby the boiler is heatedby radiation and convection; substantially as described.

2. A slag-heated boiler having a substantially closed heating-chamberexternal to the heating-surface, a series ot' molds having disconnectedmold-cavities and exposed on their u pper and lowersu rfaces to the airin the chamber, means for causing said molds to traverse the chamber,means lor supplying slag thereto, and means for cooling and coating themolds, said boilerhaving a flue or fines extending from the chamberalong the heatingsurface to a stack-opening for the passage of theheated air and gases from the molds and from the slag; substantially asdescribed.

In testimony whereof I have hereunto set my hand.

RALPH BAGGALEY.

Witnesses:

Gno. B. BLEMING, H. M. CORWIN.

